Two Different materials in One Object
Blender Render Material, Texture, UV

Not Cycles




UV Map Vase in Edit Mode .. Project from View Bounds
Material Panel.  Transparency On. Alpha Zero.
Texture Panel using UV,  Color Ramp with Colors and Alpha indicated
Texture Panel Influence Affect Color 1.0 and Alpha 1.0 as depicted
Texture Settings shown in 2 Panels to Save Vertical Space
No emphasis on Artistry. You Can do better.  Suit to your taste.





Emphasis on UV Map.  Pay no attention to the man ... rather the image behind the Vase.
Same Material and Texture Panels